Improvement in machines for making wood-pulp for paper



R. D. MOSSMAN. Machine for Making Wood Pulp for Paper".v

Patented April 9, I878 WITNESSES ATTORNEYS.

N PETERS, PHOTO-LITHOGRAPMER, WASH UNITED STATES PATENT OFFIcn,

.ROBERT D. MOSS MAN, OF BRISTOL, NEW HAMPSHIRE.

IMPROVEMENT IN MACHINES FOR MAKING WOOD-PULP FOR PAPER.

' Specification forming part of Letters Patent No- 202,1S5, dated April 9, 1878 application filed February 14, 1878.

'To all whom/it may concern:

Be it known that I, ROBERT D. MOSSMAN, of Bristol, in the county of Grafton and State of New Hampshire, have invented a new and Improved Wood-Pulp Machine, of which the following is a specification:

Figure 1 is a side elevation, partly in section, of my improved machine. Fig. 2 is a plan view, partly in section. Fig. 3 is a detail view of one of the shear-nuts. detail views of the friction-wheels.

Similar letters of reference indicate correspondin g parts.

My invention relates to the class of machines employed in the manufacture of paperpulp from blocks of wood; and it consists in a grindstone in whose face there are corundurnfilled diagonal grooves, said stone being mounted on a vertical shaft and inclosed in a curb, in diametrically-opposite sides of which there are adjustable pockets for containing the wooden blocks from which the pulp is made.

It also consists in avariable feeding device, which will press the blocks against the stone with more or less force.

Referring to the drawing, A is a platform, upon which is secured a curb, B, that is made in sections, which are bolted together and to the platform. In this curb is placed a grindstone, 0, that is carried by the vertical shaft D, which is journaled in boxes at the top of the curb and rests on a step, a, on the foundation I). A

The periphery of the stone (3 is traversed diagonally by dovetail grooves c, which are filled with a corundum paste. The number and distance apart of the diagonal corundumfilled grooves may vary with the quality and size of the stone.

In opposite sides of the curb B there are.

rectangular apertures d, at the sides of which ears 0 project from the curb. Between these ears and in the rectangular apertures 01 pockets f are placed. 7 Screws f project through slots in the ears 6, and enter the sides of the pockets for clamping them in position. In each pocket a follower is placed, which is pressedforward, so as to force the wood which is placed in the pockets against the periphery of the stone. The follower g in one of the Figs. 4 and 5 are through the outer wall of the pocket, and is provided with a head, t, which rests upon ways j thatproject from the platform A, and carries a roller, k, that is engaged by a wedge, l, sliding in ways in the standard n. The said wedge is provided with a shear-nut, 0, which is placed in a mortise in the wedge, and is opened and closed by means of the screw p.

A vertical screw, q, is journaled in the standard a and passes through the shear-nut o. A bevel-wheel, r, is secured to the upper end of the screw, and is driven by a bevel-pinion, s, on the shaft t, which is journaled in a bracket,

a, that projects from the standard a over the follower g is carried forward, pressing the wooden block against the stone with more or less force. The feed may be varied by changing the pressure on. the pulley w.

Upon the opposite side of the curb afollower, b, is'placed in the pocket f, and moved forward by a right-angled lever, c, which is secured to a shaft, 01, that is journaled in short standards that project upward from. the ears 0. This lever is connected with a shear-nut, e, on the screw g, which is supported and driven in the same manner as the screw g on the opposite side of the machine.

The shear-nut c consists of a block, g, to which are pivoted the two halves h h of the nut. A screw, t", passes through an ear that projects from one of the halves of the nut, and is received by an apertured and internallythreaded ear projecting from the other half of the nut.

By unscrewing the screw 'i' the shear-nut e is disengaged from the screw q, and the follower b may be retracted. As the stone wears away the pockets f may be moved up after loosening the screws f.

The wood to be reduced to pulp is placed in pockets is provided with a rod, h, that extends. the pockets f, with the grain running parallel with the plane of rotation of the stone 0, and is pressed against the periphery of the stone by the means already described. The stone is rotated by connection with any suitable motor, and water is poured upon thewood in the pockets.

The pulp removed from the wood is thrown by centrifugal force against the inner surface of the curb, whence it falls to the bottom and runs through a suitable sluice to a vat.

The corundum contained by the grooves c roughens the wood, and the smoother surface of the stone removes fibers which form the pulp. The force with which the wood is pressed against the stone is regulated by turning the nut a. The wood, being pressed upon diametrically-opposite sides of the stone, relieves the shaft D from lateral pressure.

Having thus described my invention, I claim as new and desire to secure by Letters Patcut- 1. A grindstone having corundum filled grooves in its periphery, as and for the purpose specified.

2. The pockets of a wood-pulping machine arranged directly opposite each other on the outside of curb and pressing toward the center, in combination with a four-section curb, whose sections fit severally between the pockets, and are provided with ears, as shown and described.

' 3. The screw q, wedge I, having the shearnut o, and the follower 9, having the rod h and head 2', in combination, substantially as herein shown and described.

4. In a wood-pulping machine, fixed collar 1;, movable collar. 1 nut a, pulley w, and shaft t, in combination, substantially as herein shown and described.

5. The combination of theri ght-angled lever c,sl1ear-nut h, screw q, and. follower b, as

herein shown and described.

6. The stone formed with narrow grooves, filled with emery, whereby the wood is first roughed up and then rubbed off, thus making a very fine and strong pulp.

ROBERT D. MOSSMAN- Witnesses:

U. SEDGWIOK, Gno. M. HOPKINS. 

